Xylem MM 307H User Manual

Series 101-A Electric Water Feeder

INSTRUCTION MANUAL

MM-307H

Applications:

For use on low pressure boilers with cold water feed. The Series 101-A can be used with mechanical or electronic low water cut-off controls.

WARNING

Do not use automatic water feeders with manual reset LWCO’s.

Failure to follow this warning could cause flooding, property damage, personal injury or death.

SPECIFICATIONS

Maximum Water Pressure: 150 psi (10.5 kg/cm2)

Maximum Boiler Pressure: 25 psi (1.76 kg/cm Maximum Boiler Size: 5000 sq. ft. EDR

2,350,000 BTU/HR

Electrical Ratings

Model Voltage Full Load

101A-120 120V 40 VA

101A-24 24V 40 VA

Output Capacity

)

with

QUICK CHANGE

Cartridge

Flow Data

Pressure Differential Flow Rate

psi (kg/cm2) gpm (lpm)

5 (.4) 1.4 (5.3) 10 (.7) 1.7 (6.4) 20 (1.4) 2.1 (7.9) 40 (2.8) 2.9 (11.0) 60 (4.2) 3.4 (12.9) 80 (5.6) 4.0 (15.1)

NOTE: 101A-24 includes a transformer with 120 volt primary and 24 volt/50VA secondary.

CAUTION

WARNING

• Before using this product read and understand instructions.

• Save these instructions for future reference.

• All work must be performed by qualified personnel trained in the proper application, installation, and maintenance of plumbing, steam, and electrical equipment and/or systems in accordance with all applicable codes and ordinances.

• Boiler manufacturer schematics should always be followed. In the event that the boiler manufacturer’s schematic does not exist, or is not available from the boiler manufacturer, refer to the schematics provided in this document.

• To prevent water damage check to make sure there is adequate floor drainage capacity. Check all components in the system to insure that they will not leak in the event of an overfeed condition.

• To prevent electrical shock, turn off the electrical power before making electrical connections.

California Proposition 65 warning! This product contains chemicals known to the

•

state of California to cause cancer and birth defects or other reproductive harm. Previous controls should never be installed on a new system. Always install new

•

controls on a new boiler or system.

Failure to follow this warning could cause property damage, personal inj ury or death.

CAUTION:

•



A more frequent replacement interval may be necessary based on the condition of the unit at time of inspection. McDonnell Miller s warranty is one (1) year from date of installation or two (2) years from the date of manufacture.

WARNING

FLOW  ARROW

6" (152mm)

6"

(152mm)

6"

(

152mm)

INSTALLATION

STEP 1 - Determine Where to Install the Water Feeder

IMPORTANT

Boiler manufacturer schematics should always be followed. In the event that the boiler manufacturer’s schematic does not exist, or is not available from the boiler manufacturer, refer to the schematics provided in this document.

Determine where to install the water feeder based on the following requirements:

a. It must be installed within eyesight of the boiler. b. A minimum 6” (152mm) clearance should be

allowed on all sides for servicing.

c. It must be installed in a horizontal pipe in the

upright position.

d. It should be installed on the cold water line.

Installation Diagram and Requirements a. Piping must be 1/2” (15mm) NPT

minimum.

b. Full port/full flow valves rated for the

pressure/temperature of the system and piping they are to be installed on.

c. Arrow on feeder casting must point in

WATER FEEDER

direction of flow into the boiler.

d. Install isolation valves and unions on

UNION

the inlet and outlet piping of the feeder for easier trouble-shooting and repair/ replacement.

FLOW ARROW

e. Install manual fill valve and bypass line

to allow for removal of the valve while the boiler is in service.

STEP 2 - Electrical Installation

IMPORTANT

NLE T VALVE

UNION

OUT LET VA LVE

UNION

CIT Y WATER SUP PLY

CHECK VALVE OR BACK FLOW PREVENTER (MAY BE REQUIRED BY LOCAL CODE OR ORDINANCES)

BYPAS S VALVE

CON NECT TO RETURN HEADER ON BOILER NOTE: DO NOT CONNECT DIR ECTLY TO BOI LER SHEL L

NOTE

Before connecting water feeder, operate boiler and check all safety devices.

NOTE

Unless otherwise noted, water feeder voltage should be the same as the LWCO and burner circuit voltage.

WARNING

LWCO

evel

• All work must be performed by qualified personnel trained in the proper application, installation, and aintenace of plumbing, steam, and electrical equipment and/or systems in accordance with all applicable

m codes and ordinances.

• To prevent electrical shock, turn off the electrical power before making electrical connections.

• To prevent an electrical fire or equipment damage, electrical wiring insulation must have a rating of

167˚F (75˚C) if the liquid’s temperature exceeds 180˚F (82˚C).

• To prevent an electrical fire or equipment damage, water feeder wiring must be on same circuit as all other

boiler controls.

Failure to follow this warning could cause property damage, personal injury or death.

a. Test the Low Water Cut-Off on the boiler.

b. Mark location of water level on sight glass where

Low Water Cut-Off turns off burner. This will be used as reference to test the water feeder’s operation.

c. Turn off all power to boiler and boiler controls.

d. Using a flathead screwdriver, remove electrical

cover plate.

f. Connect electric conduit to the water feeder’s electrical

enclosure.

g. Based on the water feeder and low water cut-off combination you are installing, select proper

wiring diagram and proceed to that page.

Water Feeder Low Water Cut-Off Page Model Model

101A-120 & 67 with 24V or 120V burner circuit ..........................................................................4

101A-24 & 67 with 24V or 120V burner circuit .......................................................................4-5

101A-120 & 67G with millivolt burner circuit ................................................................................5

101A-24 & 67G with millivolt burner circuit ................................................................................5

101A-24 & PS-802-24 ................................................................................................................6

101A-120 & PS-801-120 ..............................................................................................................6

BURNER CIRCUIT

JUMPER

12 0 VAC S

UPPLY

NEUTRAL

101A

WATER FEEDER

67 LOW WATER

CUT-OFF

12 0 VAC SUPPLY

NEUTRAL

HOT

24V

101A

WATER FEEDER

67 LOW WATER

CUT-OFF

BURNER CIRCUIT

120 VAC SUPPLY

NEUTRAL

HOT

101A

WATER FEEDER

24V TRANS FORMER (101-24 V-48)

24V

67 LOW WATER

CUT-OFF

BURNER CIRCUIT

Wiring Diagram Legends

. Bold lines indicate action to be taken in Step shown.

2. Regular black lines indicate existing wiring.

For McDonnell & Miller Model 101A-120 Water Feeder and Series 67 Low Water Cut-Off with 120 volt burner circuit

h. Connect wire (A) from water feeder to burner circuit

Neutral wire.

i. Install jumper between terminals 2 and 3 of the low

water cut-off.

j. Install wire (B) from water feeder to terminal 4 of the

low water cut-off.

For McDonnell & Miller Model 101A-120 Feeder and Series 67 Low Water Cut-Off with 24 volt burner circuit

h. Install wire (A) from water feeder to 120 volt Neutral wire. i. Install wire (B) from water feeder to terminal 4 of the low

water cut-off.

j. Install wire (C) from terminal 3 of the low water cut-off

to 120 volt Hot wire.

For Model 101A-24 Water Feeder and Series 67 Low Water Cut-Off with 24 volt burner circuit

h. Install wire (A) from burner circuit Neutral wire

to the transformer input Neutral terminal.

i. Install wire (B) from burner circuit Hot wire to the

transformer input Hot terminal.

j. Install wire (C) from transformer output Neutral

terminal to the water feeder.

k. Install wire (D) from the water feeder to terminal 4

on the low water cut-off.

l. Install wire (E) from terminal 3 on the low water

cut-off to the transformer output Hot terminal.

To prevent damage to the water feeder, a McDonnell & Miller transformer Model 101-24V-48 must be used.

IMPORTANT

MILLIVOLT

URNER

CIRCUIT

101A

FEEDER

120 VAC SUPPLY

HOT



NEUTRAL

24V TRANSFOR MER 

(101-24V-48)

101A-24

120 VAC 

SUPPLY



MILLIVOLT

BURNER CIRCUIT

4V TRANSF ORMER

(101-24 V-48)

120 VAC SUPPLY

EUTRAL

HOT

67 LOW WATER

CUT-OFF

101A-24

WATER FEEDER

BURNER CIRCUIT

For Model 101A-24 Water Feeder and Series 67 Low Water Cut-Off

with 120 volt burner circuit

h. Install wire (A) from burner circuit Neutral wire to the

transformer input Neutral terminal.

i. Install wire (B) from burner circuit Hot wire to the

transformer input Hot terminal.

j. Install wire (C) from transformer output Neutral

terminal to the water feeder.

k. Install wire (D) from the water feeder to terminal 4

on the low water cut-off.

l. Install wire (E) from terminal 3 on the low water

cut-off to the transformer output Hot terminal.

To prevent damage to the water feeder, a McDonnell & Miller transformer Model 101-24V-48 must be used.

IMPORTANT

For Model 101A-120 Feeder and Model 67G

with millivolt burner circuit

h. Install wire (A) from water feeder to 120 volt

Neutral wire.

i. Install wire (B) from water feeder to terminal 4

of the low water cut-off.

j. Install wire (C) from terminal 3 of the low water

cut-off to 120 volt Hot wire.

For Model 101A-24 Feeder and Model 67G with millivolt burner circuit

h. Install wire (A) from 120 volt circuit Neutral wire

to the transformer input Neutral terminal.

i. Install wire (B) from 120 volt circuit Hot wire to the

transformer input Hot terminal.

j. Install wire (C) from transformer output Neutral

terminal to the water feeder.

k. Install wire (D) from the water feeder to terminal 4

on the low water cut-off.

l. Install wire (E) from terminal 3 on the low water

cut-off to the transformer output Hot terminal.

To prevent damage to the water feeder, a McDonnell & Miller transformer Model 101-24V-48 must be used.

IMPORTANT

1 2 3 4 5

101A

WATER

FEEDER

HOT NEUTRAL

12 0 VAC SUP PLY

JUMPER

PS-801-120

LOW WATER CU T- OFF

BURNER

CIRCUIT

4V TRANSFORMER

(101-24 V-48)

N H C W B

BURNER

EUTRAL

120 VAC SUP PLY

JUMPER BAR

101A-24

WATER FEEDER

PS-802-24 LOW WATER CUT-OFF

For Model 101A-24 Water Feeder and Model PS-802-24 Low Water Cut-Off

eplace existing 24 volt transformer on boiler with the

R McDonnell and Miller transformer Model 101-24 V-48 included with the Model 101A-24 water feeder.

h. Install wire (A) from the water feeder to terminal N

on the low water cut-off.

i. Install wire (B) from the water feeder to terminal W

on the low water cut-off.

j. Install jumper bar or wire from terminal H to terminal

C on the low water cut-off.

IMPORTANT

To prevent damage to the water feeder, a McDonnell & Miller transformer Model 101-24V-48 must be used.

For Model 101A-120 Water Feeder and Model PS-801-120 Low Water Cut-Off

h. Install wire (A) from the water feeder to terminal 2

on the low water cut-off.

i. Install wire (B) from the water feeder to terminal 4

on the low water cut-off.

Reinstall electrical cover plate.

NOTE: The water feeder will only restore the boiler

ater level to approximately 1/2” to 1” (13-25mm)

w above the burner cut-off level of the low water cut-off.

Burner Off (Cold) Test

1. Manually fill boiler until water level in the sight glass s more than half filled.

2. With the room thermostat set at the lowest setting,

turn on the power to the boiler and water feeder.

3. Using the sight glass as a reference, slowly drain

water from boiler by opening the low water cut-off blow down valve or the boiler drain until the low water cut-off activates the water feeder.

IMPORTANT: If the water feeder does not activate before the water level reaches the bottom of the sight glass, immediately close any open drain or blow down valve and check controls and piping for proper installation. Correct any problems.

4. Using the sight glass as a reference, see that the

water feeder activates and fills to approximately 1/2” to 1” (13 - 15mm) above the burner cut-off level of the low water cut-off.

IMPORTANT: If the water feeder does not turn off once the water level has surpassed the halfway point of the sight glass, immediately turn off the power to the boiler and water feeder and check control for proper installation. Correct any problems.

5. Repeat test 2 or 3 times. Restore boiler and controls

to normal settings.

Burner On (Hot) Test

1. Manually fill the boiler to the boiler manufacturer’s recommended operating level.

2. Turn on the power to the boiler and water feeder. Activate the burner by raising the thermostat set point.

3. As steam is generated, the boiler water level will decrease. Slowly open the low water cut-off blow down valve or the boiler drain to lower the water level to the proper level, necessary to activate water feed-

er.

IMPORTANT: If the water feeder does not activate before the water level reaches the bottom of the sight glass, immediately turn off power to the boiler and close any open drain or blow down valve and check controls and piping for proper installation. Correct any problems.

4. Using the sight glass as a reference, see that the water feeder activates and fills to approximately 1/2” to 1” (13 - 15mm) above the burner cut-off level of the low water cut-off.

5. Repeat test 2 or 3 times. Restore boiler and controls to normal settings.

INSTALLATION COMPLETE

TROUBLESHOOTING

Problem:

1. Pipes rattle when valve is operating. Solution: a. Secure all piping. b. Install an air chamber on water feeder inlet pipe.

2. Water feeder doesn’t activate. Solution: a. Check wiring and connections to make sure they

are correct and secure.

b. Make sure that the low water cut-off is operating

properly.

3. Water feeder activates, but does not feed water to the boiler. Solution: a. Make sure all valves are open. b. Remove and clean strainer. c. Remove and clean cartridge valve assembly. d. Make sure the water feeder is properly piped to

the boiler.

e. Make sure the piping is not restricted or clogged.

4. Water feeder does not shut off. Solution: a. Check wiring and connections to make sure they

are correct and secure.

b. Make sure that the low water cut-off is operating

properly.

c. Make sure manual feed button operates freely.

MAINTENANCE

Use clean water to rinse components and surfaces. DO

SCHEDULE:

Annually

• Disassemble and inspect/clean strainer screen.

Replace if screen is torn or not able to be cleaned.

• Remove and inspect/clean cartridge. Replace if

poppet does not move freely or debris cannot be removed.

• Check all wires for brittle or worn insulation. More frequent cleaning or replacement may be

required if used in locations where water treatment is required or in applica water requirements.

Removal of cartridge and strainer for inspection and cleaning

A. Using a 1/2" socket wrench, unscrew the four (4) hex-head

bolts (B) that secure the strainer basket (H) to the valve assembly (E).

B. Using a 13/16" socket wrench, unscrew the cartridge (D)

and remove.

C. Clean any debris (scale, rust, etc.) from strainer and cartridge.

Poppet inside cartridge must move freely. Replace if debris cannot be removed or poppet does not move freely.

D. Lubricate cartridge o

re-install.

E. While depressing the manual feed (red) button, re-install the

cartridge and tighten 2 ft. lbs. (2.6 N•m). Do not over-tighten.

F. Re-install strainer basket. Tighten (4) bolts 8 ft. lbs. (11 N•m).

tions with high make-up

-rings using silicone type lubricant and

NOT use sharp objects to scrape off any accumulations of sediment or debris.

Replace entire unit including equalizing piping every 10 years.

Replace control if it has been subjected to water from a broken pipe or flooding.

NOTE

x 4

Broken Union Test

Make sure that the water level in the boiler is above the closing level of the feeder.

Close valve 'X' and slowly open union 'Z' to determine if valve is leaking.

• If water is leaking from the union, the valve needs

to be serviced.

• If no water leaks from the union, the feeder opera

tion is not the cause of the flooding.

Xylem, Inc.

8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.xyleminc.com/brands/mcdonnellmiller

McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries.

Feed�

Valve

Check Valve

By-Pass�

Valve

TO BOILER

WATER�

SUPPLY

Xylem MM 307H User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual